From patchwork Wed Nov 27 11:40:57 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Daniel_P=2E_Berrang=C3=A9?= X-Patchwork-Id: 13886909 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id B27ADD6ACC2 for ; Wed, 27 Nov 2024 11:42:04 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1tGGQ1-0005mF-2o; Wed, 27 Nov 2024 06:41:17 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1tGGPy-0005lx-KN for qemu-devel@nongnu.org; Wed, 27 Nov 2024 06:41:14 -0500 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1tGGPv-000269-TH for qemu-devel@nongnu.org; Wed, 27 Nov 2024 06:41:14 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1732707666; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=id3OaeYdjgfgy3s6EIFnaQIFWYIJI3fYbTAhb0KkCEk=; b=NXxNV3ConaHSu3M6TEZ0Sy6EajvoG+vIKUDB5lTl4yQszfs8RdqabZFKrP8mKrV0k7yJ/O jqqqiWchonJB8thyrQtpBi+qk4wEY1uDo8x/2SjOL7zymuUVqzOWQvhjETbK/oOC3oS77T 509pluD6VPrsHAZCsymzMS2pKdl5ePI= Received: from mx-prod-mc-02.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-623-BVMo0G1zM9C23Ci_1lMKVQ-1; Wed, 27 Nov 2024 06:41:03 -0500 X-MC-Unique: BVMo0G1zM9C23Ci_1lMKVQ-1 X-Mimecast-MFC-AGG-ID: BVMo0G1zM9C23Ci_1lMKVQ Received: from mx-prod-int-04.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-04.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.40]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-02.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id E46BF1955EEA; Wed, 27 Nov 2024 11:41:01 +0000 (UTC) Received: from toolbox.redhat.com (unknown [10.42.28.25]) by mx-prod-int-04.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 622651956054; Wed, 27 Nov 2024 11:40:58 +0000 (UTC) From: =?utf-8?q?Daniel_P=2E_Berrang=C3=A9?= To: qemu-devel@nongnu.org Cc: Yanan Wang , Eduardo Habkost , Ani Sinha , Marcel Apfelbaum , =?utf-8?q?Philippe_Mathieu-D?= =?utf-8?q?aud=C3=A9?= , Zhao Liu , =?utf-8?q?Daniel_P=2E_Berrang=C3=A9?= Subject: [PATCH] hw/core/machine: diagnose wrapping of maxmem Date: Wed, 27 Nov 2024 11:40:57 +0000 Message-ID: <20241127114057.255995-1-berrange@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.0 on 10.30.177.40 Received-SPF: pass client-ip=170.10.129.124; envelope-from=berrange@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -29 X-Spam_score: -3.0 X-Spam_bar: --- X-Spam_report: (-3.0 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.931, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org The 'maxmem' parameter parsed on the command line is held in uint64_t and then assigned to the MachineState field that is 'ram_addr_t'. This assignment will wrap on 32-bit hosts, silently changing the user's config request if it were over-sized. Improve the existing diagnositics for validating 'size', and add the same diagnostics for 'maxmem' Signed-off-by: Daniel P. Berrangé Reviewed-by: Ani Sinha --- hw/core/machine.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/hw/core/machine.c b/hw/core/machine.c index a35c4a8fae..f29fe95964 100644 --- a/hw/core/machine.c +++ b/hw/core/machine.c @@ -598,11 +598,19 @@ static void machine_set_mem(Object *obj, Visitor *v, const char *name, mem->size = mc->fixup_ram_size(mem->size); } if ((ram_addr_t)mem->size != mem->size) { - error_setg(errp, "ram size too large"); + error_setg(errp, "ram size %llu exceeds permitted maximum %llu", + (unsigned long long)mem->size, + (unsigned long long)RAM_ADDR_MAX); goto out_free; } if (mem->has_max_size) { + if ((ram_addr_t)mem->max_size != mem->max_size) { + error_setg(errp, "ram size %llu exceeds permitted maximum %llu", + (unsigned long long)mem->max_size, + (unsigned long long)RAM_ADDR_MAX); + goto out_free; + } if (mem->max_size < mem->size) { error_setg(errp, "invalid value of maxmem: " "maximum memory size (0x%" PRIx64 ") must be at least "